(This is very reductionist)

A lot of this comes down to devs not understanding infrastructure and infrastructure components and the insane interplay and complexity. And they don't care! Apps, apps apps, developers, developers, developers!

On the managerial side, it's often about deflection of responsibility for the Big Boss.

It's not part of the app itself it can be HARD, and if you're not familiar with things, then it's also scary! What if you mess up?

(Most apps don't need the elasticity, or the bells and whistles, but you're paying for them even if you don't use them, indirectly.)